Sizing on a SWK Thrifty

[Jerick]

Alright so I am on the way to purchasing my very first kilt but now I have a problem. My size at the naval (measured 3 times for average) 29.75". I am a pretty tall skinny guy almost 6 ft in height and slim. I don't know if I should purchase a small thrifty or a large youth. The youth size I am afraid will be too short and the small thrifty I am afraid will be to big for my small build. So any ideas? Also I can't decide on a tartan I like the Black Watch but I like the idea of a solid black so if you have any picks of the black shadow tartan that would be great. Thanks!